High-Density Polyethylene (HDPE) Telecommunication Corrugated Ducts are engineered to protect and manage telecommunication cables in underground installations. These. Dura-Line's traditional HDPE Standard Conduit products for utilities are of superior-quality. While offering innovative designs to make installation faster, easier, and more productive, Dura-Line manufactures a broad range of sections. It's ideal for pulls under 1000 ft. This lightweight product offers maximum flexibility, and allows. ZER uPVC Telekom Duct are manufactured in strict accordance with MS 1034, and all pipes bear our SIRIM trademark (license number PZ 1501).